docs: def calc_sha(self, checksum):
          """
          Calculate the checksum of the new exported disk, write it to
          a file, and update this managers 'exported_metadata'.
  
          Args:
              checksum(str): The type of the checksum
          """
          with LogTask('Calculating {}'.format(checksum)):
              with open(self.dst + '.hash', 'wt') as f:
                  sha = utils.get_hash(self.dst, checksum)
                  f.write(sha)
              self.exported_metadata[checksum] = sha